No functional change.
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
---
CC: Jan Beulich <jbeul...@suse.com>
---
xen/include/xen/err.h | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/xen/include/xen/err.h b/xen/include/xen/err.h
index ef77992..bea7fa3 100644
--- a/xen/include/xen/err.h
+++ b/xen/include/xen/err.h
@@ -15,19 +15,28 @@
*/
#define MAX_ERRNO 4095
+/*
+ * Individual architectures may wish to slide the error region away from its
+ * default position at the very top of virtual address space. (e.g. if Xen
+ * doesn't own the range).
+ */
+#ifndef ARCH_ERR_PTR_SLIDE
+#define ARCH_ERR_PTR_SLIDE 0
+#endif
+
static inline bool IS_ERR_VALUE(unsigned long x)
{
- return x >= (unsigned long)-MAX_ERRNO;
+ return (x + ARCH_ERR_PTR_SLIDE) >= (unsigned long)-MAX_ERRNO;
}
static inline void *__must_check ERR_PTR(long error)
{
- return (void *)error;
+ return (void *)((unsigned long)error - ARCH_ERR_PTR_SLIDE);
}
static inline long __must_check PTR_ERR(const void *ptr)
{
- return (long)ptr;
+ return (long)((unsigned long)ptr + ARCH_ERR_PTR_SLIDE);
}
static inline bool __must_check IS_ERR(const void *ptr)
--
2.1.4
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